Should I go to summer school for two classes?

I failed three classes and my summer school only allows 1-2. I wanted to summer school twice for six hours a day (each class is three hours long) and now I have to go again. But I want to go for one class so I won't have to be there all day like the other times. But my parents want me to go there for both classes and I really don't want too. But what made me think about is that my mom bride me, saying if I do go for two classes, she'll upgrade my iPhone 4 to the new iPhone 5. I thought about it but I don't know if its going to be worth it, being in six hours a day for a whole MONTH, and won't be able to have anything to enjoy the phone (plus the iPhone 6 might come out soon too but I really do what the iPhone 5). I really don't know because I hated being there all day the other two times and really don't want to be there all day this time but since I have a reward I can get bet taking two, I really don't know what to do…

Added (1). @DramaFever, they did take it away but they was gonna give it back upgraded* as the 5.

You need to think about the big picture here. Summer school is a short period of time. That up grade will last much longer than summer school will.

If you are having so much difficulty in school that you have to go to summer school each summer perhaps you need to get help during the school year so that you don't fail. Examine the reasons you fail and make a plan. That's what I would do if I didn't want to be in summer school. You are lucky your parents are considering giving you the up grade. Most parents would have taken the phone from a child who has failed 3 classes.